When driving at night outside settlements with high-beam headlights on, at what minimum distance from an oncoming vehicle must the driver switch to dipped (low) beam?

1. At least 50 meters.
2. At least 150 meters, or earlier if the oncoming driver signals by flashing their headlights.
3. At least 500 meters in all cases.
4. High beams do not need to be switched off on divided highways.